AM I WRONG?

So my husband's sister called him and was excited to tell him about the baby #3. I ran to the bathroom and cried. I was hurt or maybe just over sensitive. I've been wanting to have one for 3 years now but seems like that gift is too impossible to get. I get upset whenever I've heard about a family member got pregnant. I mean I'm happy for them but deep inside I'm sad . Is it normal or I have to quit being too over sensitive?

P.S. it's okay to judge me. I just need to let it out.